Dust seal



e. D. BECKER 2,300,395

DUST SEAL Filed April 14, 1941 NQV. .3,

. W 7 1W x 17 13 WW W7 I l v Y v E W 2% E1 WW 5w 0% 5 1 111125 1/ 1, ///12 Z Y 4 4/ //M1M/ WV m N, w M35 55 2 w a 4 w 1 a w 7 H x M. W m 2 H Patented Nov. 3, 1942 George 1). Becker, Wauwatosa, Wis, assignor to Allis-Chalmers Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Application April14, 1941, Serial No. saasso 3 Claims. (01. 308-36.1)

This invention relates to a dust seal between two relatively gyrating members, and is particularly applicable to gyratory crushers.

It is an object of this invention to provide a dust seal between two relatively gyrating members in a non-horizontal position.

Another object of the invention is to provide a simple, inexpensive dust seal having novel means for lubricating same.

Other objects will become apparent from the following description taken in conjunction with I the drawing, in which:

Fig. l is a cross-sectional elevation of a gyratory crusher provided with the dust seal of this invention; I

Fig. 2 is an enlarged fragmental cross-section of the dust seal;

Fig. 3 is a development taken along line III-III of Fig. 2; and I Fig. 4 is a sectional view of a modification.

The dust seal of this invention comprises a floating ring making circumferential and plane or spherical sealing contact with two relatively gyrating members, and provides novel wick means for lubricating the spherical surface.

The invention is shown as being applied to seal the space between the gyratory shaft or head and the fixed bearing housing of a cone type gyratory crusher, although it is also'applicable to other structures.

In the embodiment illustrated, the gyratory crusher comprises a head "l carried by a main shaft II and supporting a crushing mantle 12. The head and shaft may be suspended from a suitable bearing [3 which permits suitable gyratory, rotary and lengthwise movement of the shaft. Bearing I3 is located in a spider M bolted to top shell I5 which is in turn bolted to bottom shell l'l. Concave l3 lines the inside of top shell ii for crushing material between the mantle l2 and concave l8.

Bottom shell I1 is provided with a hub I9 which forms a bearing housing surrounding the lower part of shaft II and is provided with a bushing 21. Eccentric bearing 22 is supported (by means not shown) for rotation within bushing 2i, and is driven by any known means (not shown). Eccentric bearing 22 has an eccentric bore 2-3 preventing entry of dust and dirt into the bearing housing and eccentric bearing 22. The ree maining space betweenstationary dust collar and rotating gyrating head III is closed by a sealing ring 21 which fits within the annular' groove 29 at the bottom of head 10. The outer peripheral wall 30 of groove 29 is cylindricaland closely fits the cylindrical surface 28 of sealing ring 21. While the-contact between head I0 and sealing ring 2] is illustrated as being arranged at the outer surface 28 of the ring,.this contact could obviously be arranged at the inner surface ofring 21 and shaft llv or head N. Fig. 4 mus I trates a construction in which the sealing surface comprises the inner surface 50 of ring 21, which contacts cylindrical surface 5| on inain shaft ll.

As shaft Ii gyrates due to the rotationof ee centric bearing 22, it carries with it sealing ring 21, which is supported freely on the upper surface of dust collar 25. Since the lower part of shaft II is moved in a circular path while the upper portion of the shaft is held in relatively fixed position by bearing [3, the resultant movement of the axis of shaft ll describesla cone having its apex at 32. This conical gyrationof the shaft requires a spherical sealing surface, which is provided at 33 at the top of dust collar 25. provided at the bottom of sealing ring 21. Coacting, cylindrical surfaces 28 and 30, as well as .complementary spherical surfaces 33 and 34,

which receives the lower portion of shaft .ll.

remain in contact at all times during gyration of the crusher, effectively preventing the entrance of dust and dirt into the lubricating oil and bearings. It will be noted that shaft It may be adjusted vertically, within limits, without disturbing the dust seal.

,In prior structures of this type, difficulty was encountered in lubricating the spherical surfaces between sealing ring 27 and dust collar 25. Inadequate lubrication of these surfaces, subjected to relative rotary and gyratory movement, resulted in these surfaces becoming scratched-and scored, thereby impairing the efiectiveness of the entire dust seal.

To overcome this disadvantage of the prior .Oneor more wicks 31 are passed through ports 36, and portions of such wicks preferably extend bricating oil within the bearing housing and in along an annular groove 38 in the spherical surface 33 of dust collar 25.

A complementary spherical surface '34 is a In normal operation, lubricating oil is carried upward-around eccentric bearing 22 and between the eccentric bearing and lower portion of shaft II, and flows along the upper surface of the eccentric and back to the oil sump or oilpump (not shown) through port 40. The free depending ends of wicks 31 being in the path of oil flowing along the top of eccentric bearing 22 or splashed upward by the rotating eccentric, the wicks carry oil by capillary action through ports 36 and into annular groove 30, thereby efiectively lubricating spherical surfaces 8!, ll.

If desired, the free ends of wicks 31 may be tied together as shown in dotted lines in Fig. 3, in order to prevent the wicks from being drawn out of ports 38 during operation of the crusher.

While a specific embodiment of the invention has been illustrated and described, it is apparent that modifications and equivalents falling within the scope of the appended claims are included within the purview of this invention. It is obvious that, if the gyratory movement of shaft II were uniform throughout the length of the shaft, rather than the conical movement illustrated, surfaces 33 and 34 could be plane surfaces, instead of being spherical. However, the same provision for lubrication would be applicable.

The word shaft as used in the claims refers to the shaft per se andto the parts (such as mantle and mantle liner) rigidly attached thereto.

It is claimed and Patent:

1. Sealing means between a vertical bearing housing and a substantially vertical gyratory desired to secure by Letters shaft extending into said housing comprising a stationary dust collar at the upper end of said housing provided with an upper spherical surface. lubricating fluid having a path of flow within said housing, a substantially vertical cylindrical sealing surface carried by said shaft, a sealing ring freely supported for rotary movement on said dust collar spherical sealing surface and coacting with said cylindrical surface of said shafting, and oil wicking extending through said 7 dust collar from grooves located in said spherical sealing surface thereof into said path of flow of said lubricating fluid within said housing.

2. Sealing means as defined in claim 1, said wicking being located within said grooves in said dust collar spherical surface, the ends of said wicking passing through said dust collar and being tied together within said housing.

3. Sealing means between a stationary member and a gyrating substantially vertical shaft comprising a substantially horizontal dust collar .located. in a groove within said upper bearing surface of said dust collar and extending downward through said dust collarinto said path of lubricating fluid.

GEORGE D. BECKER. 

